A: It's a worry to me whether he is able to pass the exam or not.
我担心他是否能通过考试。

B: I think he is able to pass with your help.
有你的帮助，我想他能通过的。

A: I'm not sure.
我不敢肯定。

B: He's been working hard recently, hasn't he?
他最近一直都很努力，不是吗？
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